Which phytohormone have specific effects on cell division?

1. Ethylene
2. Gibberellins
3. Cytokinin
4. Auxin

Transpiration is highest during the summer. Which of the following reasons supports this statement?

P. Increase in temperature allows more water to evaporate.

Q. Warm air can hold more water than cold air.

R. Increase in temperature allows less water to evaporate.

1. Only P
2. Only R
3. Only P and Q
4. Only Q and R

Rajeev developed a clot at the site of bleeding. Which of the following is/are involved in the process described above?

(1) Platelets
(2) WBCs
(3) Plasma
(4) RBCs

1. Only 1
2. only 1 and 2
3. Only 1, 3 and 4
4. Only 1, 2 and 4

Name the following:

(a) The centre of reflex action.

(b) A gas responsible for greenhouse effect.

(c) The site, where the sperm and ovum unite and fuse.

(d) The cytoplasmic division of a cell.

(e) The phase of cardiac cycle, in which the auricles contract.